Home / iGCSE Chemistry 0620 Extended – 7.2 Oxides- Exam Style Questions Paper 2

iGCSE Chemistry 0620 Extended - 7.2 Oxides- Exam Style Questions Paper 2- New Syllabus

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters

Question

Four metal oxides are listed.

  1. \(\mathrm{Al_2O_3}\) 
  2. \(\mathrm{CaO}\) 
  3. \(\mathrm{CuO}\) 
  4. \(\mathrm{ZnO}\)

Which metal oxides are amphoteric?

A. 1 and 4 
B. 1 only 
C. 2, 3 and 4 
D. 2 and 3 only

▶️ Answer/Explanation

Correct Answer: A (1 and 4)

Explanation: Amphoteric oxides react with both acids and bases to form salts and water. According to the syllabus (section 7.2), \(\mathrm{Al_2O_3}\) (aluminium oxide) and \(\mathrm{ZnO}\) (zinc oxide) are amphoteric. CaO (calcium oxide) is basic, and CuO (copper(II) oxide) is basic.

✅ \(\mathrm{Al_2O_3}\) and \(\mathrm{ZnO}\) are amphoteric.

Question

Phosphorus is an element in Group V of the Periodic Table.

It burns in air to form an oxide that dissolves in water to form a solution with a pH of 1.

Which row describes this oxide of phosphorus?

▶️ Answer/Explanation
Phosphorus is a non-metal. Non-metals form non-metal oxides, which are usually acidic. The low pH of 1 confirms it is an acidic oxide.
✅ Answer: (C)

Question

Which metal oxide reacts with aqueous sodium hydroxide to form a salt and water?

A. calcium oxide
B. copper(II) oxide
C. sodium oxide
D. aluminium oxide

▶️ Answer/Explanation
Aluminium oxide (\(\mathrm{Al_2O_3}\)) is an amphoteric oxide, meaning it can react with both acids and bases. When it reacts with aqueous sodium hydroxide (a base), it forms a salt (sodium aluminate) and water: \(\mathrm{Al_2O_3 + 2NaOH + 3H_2O \rightarrow 2NaAl(OH)_4}\). Calcium oxide and copper(II) oxide are basic oxides. Sodium oxide reacts with water to form sodium hydroxide.
✅ Answer: (D)
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